I'm ok with just using Javascript to make the toolbar button, instead of C/C++.

I assume you mean by your second point that I actually have to own Acrobat professional, which I do.

I tried looking at the documentation, but it keeps crashing my browser.

However, from my experience with all other Adobe products (Studio MX, Authorware, etc), I do not expect a detailed walkthrough from start to finish, with pictures saying "click here" and such. Does this help manual actually contain this sort of thing?

The example tells me nothing. It is a one-page pdf that says 'click here to add the button' and 'click here to remove the button.' There is nothing that looks like a tutorial or walkthrough. There is nothing describing what was performed to make the button. Nowhere is there text explaining where to start.

If I don't already know what I am doing, a walkthough would be ideal for helping me learn.